# Relationship history for MSHA mine 1516567

Current hierarchy: **American Resources Corporation → KNOTT COUNTY COAL LLC → Supreme Energy Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Shell Oil Company → Supreme Energy Prep Plant; 1987-06-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knott County Coal Company → Supreme Energy Prep Plant; 1989-01-01 to 1992-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Knott County Coal Company; 1989-01-01 to 1992-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Knott County Mining Company → Supreme Energy Prep Plant; 1992-11-23 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → Supreme Energy Prep Plant; 1992-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Knott County Mining Company; 1992-11-23 to 1998-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Knott County Mining Company → Supreme Energy Prep Plant; 1998-09-02 to 2004-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Supreme Energy Prep Plant; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Knott County Mining Company; 1998-09-02 to 2004-10-03; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Supreme Energy Prep Plant; 2004-10-01 to 2011-06-14; source msha-controller-operator-history
- **operator_operates_mine:** KNOTT COUNTY COAL LLC → Supreme Energy Prep Plant; 2004-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → KNOTT COUNTY COAL LLC; 2004-10-04 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Supreme Energy Prep Plant; 2011-06-15 to 2016-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → KNOTT COUNTY COAL LLC; 2011-06-15 to 2016-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Quest Energy Corporation → Supreme Energy Prep Plant; 2016-04-12 to 2017-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Quest Energy Corporation → KNOTT COUNTY COAL LLC; 2016-04-12 to 2017-01-04; source msha-controller-operator-history
- **controller_controls_mine:** American Resources Corporation → Supreme Energy Prep Plant; 2017-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Resources Corporation → KNOTT COUNTY COAL LLC; 2017-01-05 to current/open; source msha-controller-operator-history